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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
const int NMAX=550;
char s[NMAX];
int main()
{
f.getline(s+1,550);
int lng=0;
int scad=0;
for(int i=1;s[i];i++)
if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
lng++;
//g<<lng;
int cnt=0;
for(int i=1;s[i];i++)
{
if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
{
cnt++;
while((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
{
i++;
}
}
}
if(lng==0)
{
g<<"0";
}
else
g<<lng/cnt;
return 0;
}